Transformer phasing 2

[E1tech]

We use a 480/240-120V transformer, which is fed from two legs of 480V three phase. Now I know that each phase is 120 degrees apart on the primary. What happens to the phase sequencing on the secondary?

 

[E1tech]

The transformer is single phase.

 

[DougMSOE]

The phase sequence will be the same as a single phase xfmr, from primary to the secondary. Some lead to the voltage or lag of the current as you prefer. It is assumed that this is not a potential transformer where the phase shift from primary to the secondary must be held to a very low value for revenue purposes.
Please do not confuse the primary supply with this as it truely has no bearing on the solution.

 

[peterb]

Note that what you have here is a single phase supply - there is no question of phase sequencing. The two 120V legs are 180 degrees apart - if you measure each phase angle relative to the neutral.